1 /* 2 * linux/arch/arm/mm/init.c 3 * 4 * Copyright (C) 1995-2005 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/kernel.h> 11 #include <linux/errno.h> 12 #include <linux/swap.h> 13 #include <linux/init.h> 14 #include <linux/bootmem.h> 15 #include <linux/mman.h> 16 #include <linux/export.h> 17 #include <linux/nodemask.h> 18 #include <linux/initrd.h> 19 #include <linux/of_fdt.h> 20 #include <linux/highmem.h> 21 #include <linux/gfp.h> 22 #include <linux/memblock.h> 23 #include <linux/dma-contiguous.h> 24 #include <linux/sizes.h> 25 26 #include <asm/cp15.h> 27 #include <asm/mach-types.h> 28 #include <asm/memblock.h> 29 #include <asm/prom.h> 30 #include <asm/sections.h> 31 #include <asm/setup.h> 32 #include <asm/system_info.h> 33 #include <asm/tlb.h> 34 #include <asm/fixmap.h> 35 36 #include <asm/mach/arch.h> 37 #include <asm/mach/map.h> 38 39 #include "mm.h" 40 41 #ifdef CONFIG_CPU_CP15_MMU 42 unsigned long __init __clear_cr(unsigned long mask) 43 { 44 cr_alignment = cr_alignment & ~mask; 45 return cr_alignment; 46 } 47 #endif 48 49 static phys_addr_t phys_initrd_start __initdata = 0; 50 static unsigned long phys_initrd_size __initdata = 0; 51 52 static int __init early_initrd(char *p) 53 { 54 phys_addr_t start; 55 unsigned long size; 56 char *endp; 57 58 start = memparse(p, &endp); 59 if (*endp == ',') { 60 size = memparse(endp + 1, NULL); 61 62 phys_initrd_start = start; 63 phys_initrd_size = size; 64 } 65 return 0; 66 } 67 early_param("initrd", early_initrd); 68 69 static int __init parse_tag_initrd(const struct tag *tag) 70 { 71 pr_warn("ATAG_INITRD is deprecated; " 72 "please update your bootloader.\n"); 73 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 74 phys_initrd_size = tag->u.initrd.size; 75 return 0; 76 } 77 78 __tagtable(ATAG_INITRD, parse_tag_initrd); 79 80 static int __init parse_tag_initrd2(const struct tag *tag) 81 { 82 phys_initrd_start = tag->u.initrd.start; 83 phys_initrd_size = tag->u.initrd.size; 84 return 0; 85 } 86 87 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 88 89 static void __init find_limits(unsigned long *min, unsigned long *max_low, 90 unsigned long *max_high) 91 { 92 *max_low = PFN_DOWN(memblock_get_current_limit()); 93 *min = PFN_UP(memblock_start_of_DRAM()); 94 *max_high = PFN_DOWN(memblock_end_of_DRAM()); 95 } 96 97 #ifdef CONFIG_ZONE_DMA 98 99 phys_addr_t arm_dma_zone_size __read_mostly; 100 EXPORT_SYMBOL(arm_dma_zone_size); 101 102 /* 103 * The DMA mask corresponding to the maximum bus address allocatable 104 * using GFP_DMA. The default here places no restriction on DMA 105 * allocations. This must be the smallest DMA mask in the system, 106 * so a successful GFP_DMA allocation will always satisfy this. 107 */ 108 phys_addr_t arm_dma_limit; 109 unsigned long arm_dma_pfn_limit; 110 111 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 112 unsigned long dma_size) 113 { 114 if (size[0] <= dma_size) 115 return; 116 117 size[ZONE_NORMAL] = size[0] - dma_size; 118 size[ZONE_DMA] = dma_size; 119 hole[ZONE_NORMAL] = hole[0]; 120 hole[ZONE_DMA] = 0; 121 } 122 #endif 123 124 void __init setup_dma_zone(const struct machine_desc *mdesc) 125 { 126 #ifdef CONFIG_ZONE_DMA 127 if (mdesc->dma_zone_size) { 128 arm_dma_zone_size = mdesc->dma_zone_size; 129 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 130 } else 131 arm_dma_limit = 0xffffffff; 132 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 133 #endif 134 } 135 136 static void __init zone_sizes_init(unsigned long min, unsigned long max_low, 137 unsigned long max_high) 138 { 139 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 140 struct memblock_region *reg; 141 142 /* 143 * initialise the zones. 144 */ 145 memset(zone_size, 0, sizeof(zone_size)); 146 147 /* 148 * The memory size has already been determined. If we need 149 * to do anything fancy with the allocation of this memory 150 * to the zones, now is the time to do it. 151 */ 152 zone_size[0] = max_low - min; 153 #ifdef CONFIG_HIGHMEM 154 zone_size[ZONE_HIGHMEM] = max_high - max_low; 155 #endif 156 157 /* 158 * Calculate the size of the holes. 159 * holes = node_size - sum(bank_sizes) 160 */ 161 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 162 for_each_memblock(memory, reg) { 163 unsigned long start = memblock_region_memory_base_pfn(reg); 164 unsigned long end = memblock_region_memory_end_pfn(reg); 165 166 if (start < max_low) { 167 unsigned long low_end = min(end, max_low); 168 zhole_size[0] -= low_end - start; 169 } 170 #ifdef CONFIG_HIGHMEM 171 if (end > max_low) { 172 unsigned long high_start = max(start, max_low); 173 zhole_size[ZONE_HIGHMEM] -= end - high_start; 174 } 175 #endif 176 } 177 178 #ifdef CONFIG_ZONE_DMA 179 /* 180 * Adjust the sizes according to any special requirements for 181 * this machine type. 182 */ 183 if (arm_dma_zone_size) 184 arm_adjust_dma_zone(zone_size, zhole_size, 185 arm_dma_zone_size >> PAGE_SHIFT); 186 #endif 187 188 free_area_init_node(0, zone_size, min, zhole_size); 189 } 190 191 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 192 int pfn_valid(unsigned long pfn) 193 { 194 return memblock_is_map_memory(__pfn_to_phys(pfn)); 195 } 196 EXPORT_SYMBOL(pfn_valid); 197 #endif 198 199 #ifndef CONFIG_SPARSEMEM 200 static void __init arm_memory_present(void) 201 { 202 } 203 #else 204 static void __init arm_memory_present(void) 205 { 206 struct memblock_region *reg; 207 208 for_each_memblock(memory, reg) 209 memory_present(0, memblock_region_memory_base_pfn(reg), 210 memblock_region_memory_end_pfn(reg)); 211 } 212 #endif 213 214 static bool arm_memblock_steal_permitted = true; 215 216 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 217 { 218 phys_addr_t phys; 219 220 BUG_ON(!arm_memblock_steal_permitted); 221 222 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 223 memblock_free(phys, size); 224 memblock_remove(phys, size); 225 226 return phys; 227 } 228 229 void __init arm_memblock_init(const struct machine_desc *mdesc) 230 { 231 /* Register the kernel text, kernel data and initrd with memblock. */ 232 #ifdef CONFIG_XIP_KERNEL 233 memblock_reserve(__pa(_sdata), _end - _sdata); 234 #else 235 memblock_reserve(__pa(_stext), _end - _stext); 236 #endif 237 #ifdef CONFIG_BLK_DEV_INITRD 238 /* FDT scan will populate initrd_start */ 239 if (initrd_start && !phys_initrd_size) { 240 phys_initrd_start = __virt_to_phys(initrd_start); 241 phys_initrd_size = initrd_end - initrd_start; 242 } 243 initrd_start = initrd_end = 0; 244 if (phys_initrd_size && 245 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 246 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 247 (u64)phys_initrd_start, phys_initrd_size); 248 phys_initrd_start = phys_initrd_size = 0; 249 } 250 if (phys_initrd_size && 251 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 252 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 253 (u64)phys_initrd_start, phys_initrd_size); 254 phys_initrd_start = phys_initrd_size = 0; 255 } 256 if (phys_initrd_size) { 257 memblock_reserve(phys_initrd_start, phys_initrd_size); 258 259 /* Now convert initrd to virtual addresses */ 260 initrd_start = __phys_to_virt(phys_initrd_start); 261 initrd_end = initrd_start + phys_initrd_size; 262 } 263 #endif 264 265 arm_mm_memblock_reserve(); 266 267 /* reserve any platform specific memblock areas */ 268 if (mdesc->reserve) 269 mdesc->reserve(); 270 271 early_init_fdt_reserve_self(); 272 early_init_fdt_scan_reserved_mem(); 273 274 /* reserve memory for DMA contiguous allocations */ 275 dma_contiguous_reserve(arm_dma_limit); 276 277 arm_memblock_steal_permitted = false; 278 memblock_dump_all(); 279 } 280 281 void __init bootmem_init(void) 282 { 283 unsigned long min, max_low, max_high; 284 285 memblock_allow_resize(); 286 max_low = max_high = 0; 287 288 find_limits(&min, &max_low, &max_high); 289 290 early_memtest((phys_addr_t)min << PAGE_SHIFT, 291 (phys_addr_t)max_low << PAGE_SHIFT); 292 293 /* 294 * Sparsemem tries to allocate bootmem in memory_present(), 295 * so must be done after the fixed reservations 296 */ 297 arm_memory_present(); 298 299 /* 300 * sparse_init() needs the bootmem allocator up and running. 301 */ 302 sparse_init(); 303 304 /* 305 * Now free the memory - free_area_init_node needs 306 * the sparse mem_map arrays initialized by sparse_init() 307 * for memmap_init_zone(), otherwise all PFNs are invalid. 308 */ 309 zone_sizes_init(min, max_low, max_high); 310 311 /* 312 * This doesn't seem to be used by the Linux memory manager any 313 * more, but is used by ll_rw_block. If we can get rid of it, we 314 * also get rid of some of the stuff above as well. 315 */ 316 min_low_pfn = min; 317 max_low_pfn = max_low; 318 max_pfn = max_high; 319 } 320 321 /* 322 * Poison init memory with an undefined instruction (ARM) or a branch to an 323 * undefined instruction (Thumb). 324 */ 325 static inline void poison_init_mem(void *s, size_t count) 326 { 327 u32 *p = (u32 *)s; 328 for (; count != 0; count -= 4) 329 *p++ = 0xe7fddef0; 330 } 331 332 static inline void 333 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 334 { 335 struct page *start_pg, *end_pg; 336 phys_addr_t pg, pgend; 337 338 /* 339 * Convert start_pfn/end_pfn to a struct page pointer. 340 */ 341 start_pg = pfn_to_page(start_pfn - 1) + 1; 342 end_pg = pfn_to_page(end_pfn - 1) + 1; 343 344 /* 345 * Convert to physical addresses, and 346 * round start upwards and end downwards. 347 */ 348 pg = PAGE_ALIGN(__pa(start_pg)); 349 pgend = __pa(end_pg) & PAGE_MASK; 350 351 /* 352 * If there are free pages between these, 353 * free the section of the memmap array. 354 */ 355 if (pg < pgend) 356 memblock_free_early(pg, pgend - pg); 357 } 358 359 /* 360 * The mem_map array can get very big. Free the unused area of the memory map. 361 */ 362 static void __init free_unused_memmap(void) 363 { 364 unsigned long start, prev_end = 0; 365 struct memblock_region *reg; 366 367 /* 368 * This relies on each bank being in address order. 369 * The banks are sorted previously in bootmem_init(). 370 */ 371 for_each_memblock(memory, reg) { 372 start = memblock_region_memory_base_pfn(reg); 373 374 #ifdef CONFIG_SPARSEMEM 375 /* 376 * Take care not to free memmap entries that don't exist 377 * due to SPARSEMEM sections which aren't present. 378 */ 379 start = min(start, 380 ALIGN(prev_end, PAGES_PER_SECTION)); 381 #else 382 /* 383 * Align down here since the VM subsystem insists that the 384 * memmap entries are valid from the bank start aligned to 385 * MAX_ORDER_NR_PAGES. 386 */ 387 start = round_down(start, MAX_ORDER_NR_PAGES); 388 #endif 389 /* 390 * If we had a previous bank, and there is a space 391 * between the current bank and the previous, free it. 392 */ 393 if (prev_end && prev_end < start) 394 free_memmap(prev_end, start); 395 396 /* 397 * Align up here since the VM subsystem insists that the 398 * memmap entries are valid from the bank end aligned to 399 * MAX_ORDER_NR_PAGES. 400 */ 401 prev_end = ALIGN(memblock_region_memory_end_pfn(reg), 402 MAX_ORDER_NR_PAGES); 403 } 404 405 #ifdef CONFIG_SPARSEMEM 406 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 407 free_memmap(prev_end, 408 ALIGN(prev_end, PAGES_PER_SECTION)); 409 #endif 410 } 411 412 #ifdef CONFIG_HIGHMEM 413 static inline void free_area_high(unsigned long pfn, unsigned long end) 414 { 415 for (; pfn < end; pfn++) 416 free_highmem_page(pfn_to_page(pfn)); 417 } 418 #endif 419 420 static void __init free_highpages(void) 421 { 422 #ifdef CONFIG_HIGHMEM 423 unsigned long max_low = max_low_pfn; 424 struct memblock_region *mem, *res; 425 426 /* set highmem page free */ 427 for_each_memblock(memory, mem) { 428 unsigned long start = memblock_region_memory_base_pfn(mem); 429 unsigned long end = memblock_region_memory_end_pfn(mem); 430 431 /* Ignore complete lowmem entries */ 432 if (end <= max_low) 433 continue; 434 435 if (memblock_is_nomap(mem)) 436 continue; 437 438 /* Truncate partial highmem entries */ 439 if (start < max_low) 440 start = max_low; 441 442 /* Find and exclude any reserved regions */ 443 for_each_memblock(reserved, res) { 444 unsigned long res_start, res_end; 445 446 res_start = memblock_region_reserved_base_pfn(res); 447 res_end = memblock_region_reserved_end_pfn(res); 448 449 if (res_end < start) 450 continue; 451 if (res_start < start) 452 res_start = start; 453 if (res_start > end) 454 res_start = end; 455 if (res_end > end) 456 res_end = end; 457 if (res_start != start) 458 free_area_high(start, res_start); 459 start = res_end; 460 if (start == end) 461 break; 462 } 463 464 /* And now free anything which remains */ 465 if (start < end) 466 free_area_high(start, end); 467 } 468 #endif 469 } 470 471 /* 472 * mem_init() marks the free areas in the mem_map and tells us how much 473 * memory is free. This is done after various parts of the system have 474 * claimed their memory after the kernel image. 475 */ 476 void __init mem_init(void) 477 { 478 #ifdef CONFIG_HAVE_TCM 479 /* These pointers are filled in on TCM detection */ 480 extern u32 dtcm_end; 481 extern u32 itcm_end; 482 #endif 483 484 set_max_mapnr(pfn_to_page(max_pfn) - mem_map); 485 486 /* this will put all unused low memory onto the freelists */ 487 free_unused_memmap(); 488 free_all_bootmem(); 489 490 #ifdef CONFIG_SA1111 491 /* now that our DMA memory is actually so designated, we can free it */ 492 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 493 #endif 494 495 free_highpages(); 496 497 mem_init_print_info(NULL); 498 499 #define MLK(b, t) b, t, ((t) - (b)) >> 10 500 #define MLM(b, t) b, t, ((t) - (b)) >> 20 501 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 502 503 pr_notice("Virtual kernel memory layout:\n" 504 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 505 #ifdef CONFIG_HAVE_TCM 506 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 507 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 508 #endif 509 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 510 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 511 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 512 #ifdef CONFIG_HIGHMEM 513 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 514 #endif 515 #ifdef CONFIG_MODULES 516 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 517 #endif 518 " .text : 0x%p" " - 0x%p" " (%4td kB)\n" 519 " .init : 0x%p" " - 0x%p" " (%4td kB)\n" 520 " .data : 0x%p" " - 0x%p" " (%4td kB)\n" 521 " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", 522 523 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 524 (PAGE_SIZE)), 525 #ifdef CONFIG_HAVE_TCM 526 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 527 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 528 #endif 529 MLK(FIXADDR_START, FIXADDR_END), 530 MLM(VMALLOC_START, VMALLOC_END), 531 MLM(PAGE_OFFSET, (unsigned long)high_memory), 532 #ifdef CONFIG_HIGHMEM 533 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 534 (PAGE_SIZE)), 535 #endif 536 #ifdef CONFIG_MODULES 537 MLM(MODULES_VADDR, MODULES_END), 538 #endif 539 540 MLK_ROUNDUP(_text, _etext), 541 MLK_ROUNDUP(__init_begin, __init_end), 542 MLK_ROUNDUP(_sdata, _edata), 543 MLK_ROUNDUP(__bss_start, __bss_stop)); 544 545 #undef MLK 546 #undef MLM 547 #undef MLK_ROUNDUP 548 549 /* 550 * Check boundaries twice: Some fundamental inconsistencies can 551 * be detected at build time already. 552 */ 553 #ifdef CONFIG_MMU 554 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 555 BUG_ON(TASK_SIZE > MODULES_VADDR); 556 #endif 557 558 #ifdef CONFIG_HIGHMEM 559 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 560 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 561 #endif 562 563 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 564 extern int sysctl_overcommit_memory; 565 /* 566 * On a machine this small we won't get 567 * anywhere without overcommit, so turn 568 * it on by default. 569 */ 570 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 571 } 572 } 573 574 #ifdef CONFIG_ARM_KERNMEM_PERMS 575 struct section_perm { 576 unsigned long start; 577 unsigned long end; 578 pmdval_t mask; 579 pmdval_t prot; 580 pmdval_t clear; 581 }; 582 583 static struct section_perm nx_perms[] = { 584 /* Make pages tables, etc before _stext RW (set NX). */ 585 { 586 .start = PAGE_OFFSET, 587 .end = (unsigned long)_stext, 588 .mask = ~PMD_SECT_XN, 589 .prot = PMD_SECT_XN, 590 }, 591 /* Make init RW (set NX). */ 592 { 593 .start = (unsigned long)__init_begin, 594 .end = (unsigned long)_sdata, 595 .mask = ~PMD_SECT_XN, 596 .prot = PMD_SECT_XN, 597 }, 598 #ifdef CONFIG_DEBUG_RODATA 599 /* Make rodata NX (set RO in ro_perms below). */ 600 { 601 .start = (unsigned long)__start_rodata, 602 .end = (unsigned long)__init_begin, 603 .mask = ~PMD_SECT_XN, 604 .prot = PMD_SECT_XN, 605 }, 606 #endif 607 }; 608 609 #ifdef CONFIG_DEBUG_RODATA 610 static struct section_perm ro_perms[] = { 611 /* Make kernel code and rodata RX (set RO). */ 612 { 613 .start = (unsigned long)_stext, 614 .end = (unsigned long)__init_begin, 615 #ifdef CONFIG_ARM_LPAE 616 .mask = ~L_PMD_SECT_RDONLY, 617 .prot = L_PMD_SECT_RDONLY, 618 #else 619 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), 620 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, 621 .clear = PMD_SECT_AP_WRITE, 622 #endif 623 }, 624 }; 625 #endif 626 627 /* 628 * Updates section permissions only for the current mm (sections are 629 * copied into each mm). During startup, this is the init_mm. Is only 630 * safe to be called with preemption disabled, as under stop_machine(). 631 */ 632 static inline void section_update(unsigned long addr, pmdval_t mask, 633 pmdval_t prot) 634 { 635 struct mm_struct *mm; 636 pmd_t *pmd; 637 638 mm = current->active_mm; 639 pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); 640 641 #ifdef CONFIG_ARM_LPAE 642 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 643 #else 644 if (addr & SECTION_SIZE) 645 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); 646 else 647 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); 648 #endif 649 flush_pmd_entry(pmd); 650 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); 651 } 652 653 /* Make sure extended page tables are in use. */ 654 static inline bool arch_has_strict_perms(void) 655 { 656 if (cpu_architecture() < CPU_ARCH_ARMv6) 657 return false; 658 659 return !!(get_cr() & CR_XP); 660 } 661 662 #define set_section_perms(perms, field) { \ 663 size_t i; \ 664 unsigned long addr; \ 665 \ 666 if (!arch_has_strict_perms()) \ 667 return; \ 668 \ 669 for (i = 0; i < ARRAY_SIZE(perms); i++) { \ 670 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || \ 671 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { \ 672 pr_err("BUG: section %lx-%lx not aligned to %lx\n", \ 673 perms[i].start, perms[i].end, \ 674 SECTION_SIZE); \ 675 continue; \ 676 } \ 677 \ 678 for (addr = perms[i].start; \ 679 addr < perms[i].end; \ 680 addr += SECTION_SIZE) \ 681 section_update(addr, perms[i].mask, \ 682 perms[i].field); \ 683 } \ 684 } 685 686 static inline void fix_kernmem_perms(void) 687 { 688 set_section_perms(nx_perms, prot); 689 } 690 691 #ifdef CONFIG_DEBUG_RODATA 692 void mark_rodata_ro(void) 693 { 694 set_section_perms(ro_perms, prot); 695 } 696 697 void set_kernel_text_rw(void) 698 { 699 set_section_perms(ro_perms, clear); 700 } 701 702 void set_kernel_text_ro(void) 703 { 704 set_section_perms(ro_perms, prot); 705 } 706 #endif /* CONFIG_DEBUG_RODATA */ 707 708 #else 709 static inline void fix_kernmem_perms(void) { } 710 #endif /* CONFIG_ARM_KERNMEM_PERMS */ 711 712 void free_tcmmem(void) 713 { 714 #ifdef CONFIG_HAVE_TCM 715 extern char __tcm_start, __tcm_end; 716 717 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 718 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 719 #endif 720 } 721 722 void free_initmem(void) 723 { 724 fix_kernmem_perms(); 725 free_tcmmem(); 726 727 poison_init_mem(__init_begin, __init_end - __init_begin); 728 if (!machine_is_integrator() && !machine_is_cintegrator()) 729 free_initmem_default(-1); 730 } 731 732 #ifdef CONFIG_BLK_DEV_INITRD 733 734 static int keep_initrd; 735 736 void free_initrd_mem(unsigned long start, unsigned long end) 737 { 738 if (!keep_initrd) { 739 if (start == initrd_start) 740 start = round_down(start, PAGE_SIZE); 741 if (end == initrd_end) 742 end = round_up(end, PAGE_SIZE); 743 744 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 745 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 746 } 747 } 748 749 static int __init keepinitrd_setup(char *__unused) 750 { 751 keep_initrd = 1; 752 return 1; 753 } 754 755 __setup("keepinitrd", keepinitrd_setup); 756 #endif 757